The IoT-based Smart Home Automation with Voice Control system is a modern solution that brings convenience, energy efficiency, and security to residential settings. This project allows users to control home appliances such as lights, fans, and other electrical devices using simple voice commands through Google Assistant or Amazon Alexa. The system operates using a Wi-Fi-enabled microcontroller like ESP32 or ESP8266, which is responsible for receiving commands and toggling relays that are connected to household appliances.
By integrating platforms like IFTTT (If This Then That) or Blynk, the system bridges the gap between user voice commands and device control. Once the voice command is processed, IFTTT triggers a webhook or HTTP request that is received by the ESP module. The ESP then activates or deactivates the respective relay channels, switching the connected appliances on or off.
Additionally, the system can be expanded to include mobile app control using Blynk or Firebase for remote monitoring and manual control when voice is not practical. This dual-mode control enhances the usability and flexibility of the system.
This solution is cost-effective, scalable, and highly customizable, making it perfect for DIY enthusiasts, students, and even real-world smart home installations. The implementation demonstrates the powerful combination of IoT, cloud services, and voice recognition to bring smart automation to homes.
 
 
Features:
Voice-controlled ON/OFF switching for appliances.
Remote monitoring using a smartphone (via Blynk).
Wi-Fi connectivity (no physical switches needed).
Expandable for multiple devices and rooms.
Works with Google Assistant and Alexa.
Cost-effective and beginner-friendly.
 
 
Components Used:
ESP32/ESP8266 NodeMCU—a microcontroller with built-in Wi-Fi for controlling appliances.
4-Channel Relay Module—To switch multiple AC appliances like lights and fans.
Voice Assistant Integration (Google Assistant via IFTTT)—for receiving voice commands.
Smartphone with Google Home/Alexa App—Acts as the voice interface.
Blynk App (Optional) – To monitor and control devices manually via phone.
5V Power Supply/Adapter—To power the circuit.
Wires, connectors, and breadboard/PCB—for circuit assembly.
Indicator LEDs (optional)—To show relay status.
Plastic Enclosure Box—For safety and neat packaging.
 
 
How It Works :
The system is powered by an ESP32 or ESP8266 microcontroller, which connects to your home Wi-Fi network. Voice commands given via Google Assistant are routed through IFTTT, which sends a web request to the microcontroller. The ESP interprets these commands and triggers specific relay channels to turn ON/OFF appliances like lights or fans. Each relay acts like a smart switch. Optionally, the user can also use the Blynk app to manually control the appliances when voice command is not possible. This setup creates a seamless voice and app-based control system, ideal for modern smart homes.
Dimensions : 
15 cm × 10 cm × 7 cm